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To find out when the bells ring at the same time between 8:00 am, we need to find the least common multiple (LCM) of 30 minutes and 40 minutes. The LCM of 30 and 40 is 120 minutes. This means that every 120 minutes, or every 2 hours, both bells will ring simultaneously. So, the bells will ring at the same time between 8:00 am at 8:00 am + 2 hours = 10:00 am.
11.45 am
On ships at sea, a practical measure of time is the watch, a period of 4 hours. The watch is divided into 8 bells, so one bell equals 1/2 hour or 30 minutes. Every 30 minutes the ship's bell sounds the number of bells elapsed since the start of the watch.
We observe a moment of silence at the 11th hour of the 11th day of the 11th month, i.e., 11:00am - the length of the period of silence is generally two minutes. Tigraine
every 72 minutes
9pm local time
Here is a Navy chart which lists the bells and time..
One Time Bells was created on 2002-05-07.
Watches were 4 hours long. The ships timekeeper would start an hour glass that was one half hour long in its time. When the hour glass was turned over, the next set of bells would start. So the first half hour war 1 bell, the second half hour was 2 bells etc. At the end of the 4 hour watch, it was eight bells, and time for the next crew change for the next watch.
Silence...... after you speak, silence is broken.
It is a long silence or, silent for a long time.
The last time I heard of that happening was on Sunday, December 14, 1980 at 14:00 (2 PM) New York time.